Control for carburetors



'. Oct. 27, 1925- R. E. cARLsoN CONTROL FOR CARBURETORS Filed Sept. 27, 1924 Patentedoct, 27, 1925. j

1,558,590 UNITED'gSTATES PATENT OFFICE.

"RAY yroNn E. cr mson, or WASHINGTON, nrs'rnrcr OF COLUMBIA.

coN'rnoL non .cARBU-RE'roRs Application filed September 27, 1924. Serial No. 740,368.

To all whom 2'1 may com-em;

Be it known that l, RAYMOND E. (/ARLSON,

a citizen of the United States, and resident of lVashington, District of Columbia, have invented new and useful Imprcwements in of which the 01 in the starting of the engine. various manually opci'ated nleans are provided for shut ting oil or choking the air supply to the carburetor; controlling the auxiliary 811 valve, and moving the carburetor mctcrlng valves 1 Operators of automobiles are inclined to overlook these manually operated devices and allow the engines to operate under a very rich mixturewith the result that the engines are damaged and -further the engine does not operate as efiicientlyona rich mixture as o'na lean mixture or a mixture properly proportioned for effective performance of theengine under varying conditions of weather and power plant characteristics.

An object of this invention is in the provision of means for manually adjusting the carburetor to supply a rich mixture during the starting ofthe motor, and to automati: rally cause the means to gradually return the carburetor to a normal condition of the operation after the engine had become sutficicntly warm to operate under the conditions 0-? the normal mixture to which the carbuetor is adjusted to supply, and the possil-iiiity of damage to the engine and the inellertive operation thereof is eliminated.

The invention consists of certain novel 'eatures of construction and combination of parts which will be hereinafter described and pointed out in the claims.

In the accompanying drawing:

Figure 1, is a view in vertical section and partly in elevation, showing the invention applied to the mechanism ot a choke valve of a carburetor, and

Figure2 is a view in elevation of the cylinder;

-arm 24.

The cylinder 20, has a plug 26 fitted in the.

In the drawing, the application of the invention has been shown applied to the choke valve 10, of a carburetor 11, however it is perfectly feasible to apply the device to auxiliary air intake valve and the metering valve of the carburetor, however it has not been deemed necessary to illustrate these various applications of the device, asthe principle of operation is the same.

The choke valve 1.0 is joined in the air in let ofthe carburetorand has an arm 12, connected thereto, to which a spring 13, is attached, one end of the spring being con-' nected" to the carburetor, for normally hold The arm 12, is con.-

ing the valve open.

ncctedby a link 14, to a bell crank 15. The.

bell-crank 15, is mounted on, the tronto-f the dash or instrument board 16, of an automobile, and the upper arm 17 of the bell crank has a rod 18, pivotally connected thereto"; The rod 18, extends through the dash-board 16,,and has a knob 19, thereon to be grasped by the operator for opening and closing the choke valve 10. I

-Mounted on the dash-board l6 beneath the bell-crank 15, is an air-cylinder 20, by means of a bracket 21. slide in the cylinder 20, and is provided with a rod 23, which extends through the upper end of the cylinder 20 and connected to the lower arm 24 of the bell-crank 15 by a pin 25 which extends through a slot 26 in the lower end thereof, and the plug is provided with an air duct 27 leading therethrough to the interior of the cylinder. A needle valve 28 has screw-threaded engagement with the plug and enters the conduit for the purpose 0t regulating theleakage of air from the cylinder 20.

The wall of the cylinder is provided with i A piston 22 is mounted to a series of perforations'or openings 29, 29,

three being shown, therein, and a side valve 30 is mounted on the cylinder and provided with an opening 31, adapted to be brought into registry with one of the series of openings 29, for governing the position of the choke valve 10. The valve 30 is held imn's adjusted position and in registrywvith th respective opening 29, by means of a nut 32 mounted on a screw thread stud 33 which is -mounted on the cylinder 20 and extends through a slot 34 in the valve 30.

The valve 30 is set so as to cause the opening 31 therein to register with one of the cylinder 20, until the piston passesthe 0pen-' ing 29, in the cylindere20. Theposition which would be assumed by the chokevalve 10, that is partially closed, would remain in this position after the operator had released the knob 19. However the piston 22 will now gradually tall or drop. in the cylinder 20, causing the choke-valve to returnto the open position as the'airlescapes or bleeds through the duct 27, vaccording to the adjustment of the needle valve 28, and

20s forcing the air out of the cylinder.2 0,which was drawn in when the piston 22 was pulledupwardly in the cylinder on theioperation of the rod 18.

The downward movement of the as the air beneath it gradually escapes through" the duct 27, causes the piston-rod 23 of the piston to actuate the bell-crank 15,

lowering the arm 24, and thereby operating the link 14 which will cause the choke valve to swing to an open position.

The foregoing description of theopera tion is the same for the various adjustments of the valve 30 with respect to the series of openings 29 ofthe cylinder 20. The upper most opening 29, is employed and the opening- 31 of the valve -3 0 brought into registrytherewith in cold weather when it is desired to more fully close the choke valve 1O,ai1d ppvide a richerrnixture' delivered to the engine. i 1

It will therefore be appreciated that with ,this device the amount of air to be admitted to ,the fuel deliveredito the engine instartit-. can be regulated by the valve 30. That the choke valve 10, will be gradually brought J to a full open-position automatically due to the gradual fall of the piston- 22 in th cy1-' be regulated by the I p Y to gradually increase-the admission of air inder 20,'and which may needle valve 28;

There is no danger of thechoke valve bet-- ing left fully or partially closed bythe oppiston 22 the knob 19 by the operator the cylinder 20 and piston 22, in connection withthe spring 13, begin to function to produce a gradual opening of thechoke valve, and this degree of opening of the choke valve is overned by t e needle 28,'and the extent 0? closing of the choke valve is governed by the valve' 30.

Having described-my invention what I claim, is:- I 1. The combination with a carburetor, or a valve, means for operating the valve for causing the delivery from the carburetor of a richer mixture of fuel than employed in the normal operation of an engine, and

means for gradually causing said valve to function to produce a normal mixture to be delivered from the carburetor.

2.- The combination with a carburetor, of

manually operated means for causing the delivery from the carburetor of a richer mixture of fuel than employed in the normal operation of. an engine, and means for gradually causing 'said manual means to air to the carburetor, and automatic means associated with said manual means for gradually returning'the choke valve to open :position.

4. The combination with a carburetor, of

manually operable means for restrictingthe supply of air to the carburetor, and automatic means associated therewith for gradually increasing theadinission ofair to the carburetor,

5. The'combinatio'n with acarburetor, of

'manual operable means'for restricting the supply of air to thecarburetor consisting of 1 a value, a bell-crank" associated therewith,

and means for operating 'the bell-crankyand an aircylinder having a'piston therein, said piston being? connected to fireball-crank, said cylinder and piston automatically causing said manually operated mean's'to operate .jnaYMonnn oannsoN Q 

